Re: [w3c/ServiceWorker] Inconsistencies due to when clients are created (#870)

@slightlyoff, I think we can do something like this:

```js
self.onfetch = e => {
  if (e.request.destination === 'document') {
    // This is a navigation.
    clients.get(e.targetClientId).then(client => {
      if (client.ancestorOrigins.length === 0) {
        // And it's a top-level.
      }
    });
  }
};
```

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